The aim of this workshop is to pin-­point the suitability of levitated optomechanics as a test-­bed for the investigation of the validity of quantum theory at the mesoscopic and macroscopic scale;; identify the fundamental challenges of such tests and the it will address opportunities offered by a space-­based configuration;; compare the capabilities of levitated optomechanics to those of other platforms such as magneto-­levitated one for the identification of the best-­suited experimental platform.